26 DR. p. p. CARPENTER ON THE SHELLS OF PANAMA. 



d contains parts of six specimens, and perhaps should be a, no. 400. 

 They appiar to be a variety vi^ Lith(ij)li(i(jus cinnantomeus, M. 1/7, 

 but with broken shells, &c., airgiiitiiiized on the posterior side. /(I) 

 contains four S|iecin)ens of M. niultlforiiiin, the seniigreeuish variety 

 (Maz. Cat. p. Ill)), and are probably intended fore. / {-) contains 

 two specimens of the same variety of J/, multijunnis, in the burrow 

 of a Lithophayns, and may stand for d or e. 



40.T. Chamn huddia}ia-= C. {Ifrondosa, \{iT.)/ornicata, M. 121,6. 

 Additional specimens confirm me in regarding this species as distinct 

 from all varieties oi frondosn. The Professor's shells riot being very 

 characteristic, the diagnosi s do not exacth accord. The shell stands 

 as C buddiana. 



406. Chaiiia 1 corrufjata. The large valve appears a dead reversed 

 C {frondosa) mexicona, M. 121, with the teeth perforated by Li- 

 fhophagi. The other may be corriujata, very dead, of sienna-tint, 

 very pointed dorsally. 



407. Chama echinata. These appear to me to be ttiC young, partly 

 of C. buddiana, but principally of t'. mexicaiia. 



408. Nucula elenensis=^Leda e., M. 199. 



409. Nucula exigua, M. 198, 



410. Nucula poliia=Leda p. With semidia^onal lines. 



411. Pectunculus assimi/is+P. incEqualis, M. 190, 



412. Pectunculus hnaculatus. Stet. 



413. Area alternata=^ Barbatia a., M. 188. 



414. Area laviculuides appears a young Scapharca. 



415. Area emarginata=^ Scapharca e., M. 187. 

 410. Area gradata^=Barbatia g.,^1. 194. 



417. Area grandis, M. 180. 



418. Area mutabilis=^Bijssoarca m., M. 190. 



419. Area {Byssoarcu) pholadiformis. This is simply an elon- 

 gated form of Barbatia gradata, probably from growing in the hole 

 of a Lithophugus. The umbos are " flattened " by erosion ; teeth 

 not " obsolete " under the glass ; " ligameut concealed " simply by 

 the compressed and elongated growth. 



420. Area reeviaiia=^ Barbatia r. 



421. Area recersa = Noetia r., M. 185. 



422. Area similis. This is scarcely a var' ,.y of ^. tuberculosa, 

 TV[. 1»4. The specimens are dead and oiled, with most of the epi- 

 dermis abraded. 



423. Area soUda — Barbatia s., M. 195. 



424. Area {Byssoarcu) tobagensis=- Barbatia illota, M. 193. 



425. Area tuberculosa, M. 184. 



426. Area, sp. ind. a. These little shells approach the Noffi'a 



200 



